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# lec6 - ENGR 111 Lecture 6 Reading Chapters 20 Class notes...

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ENGR 111 Lecture 6 Reading: Chapters 20 Class notes

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Fall 2004 Review of last class z Power consumption inversely proportional to resistance P = IV = V 2 /R z Energy is total power consumed over time U = Q V (remember I = dQ/dt) z AC currents vary over time { Produced when a conductor is rotated in a magnetic field –most power produced this way z Transformers operate on AC – scale voltages up or down
Fall 2004 AC Fundamentals z AC generator animation z RMS Voltage allows Power = V 2 /R z A transformer in action – scales AC voltages up/down

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Fall 2004 Capacitance z Two conducting plates, separated by an insulator z Can’t pass through current continuously, but current can pass for a short time { Current charges one plate, equal, opposite charge builds on the other plate, allowing current to pass z Charging a capacitor
Fall 2004 Capacitance z Charge doesn’t really go through the device z Quantity of balanced (stored) charges Q = C V z C = Capacitance, measured in Farads (F) or microFarads ( μ F) or picoFarads (pF) z AC can pass: I = dQ/dt = C dV/dt

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